package com.jing.yao.utils;

import com.alibaba.fastjson.JSON;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;

import java.util.HashSet;
import java.util.List;
import java.util.Set;


public class PropertyCopier {

    private PropertyCopier() {
    }

    public static void copyProperties(Object source, Object target) {
        BeanUtils.copyProperties(source, target);
    }

    public static <T> List<T> copyListProperties(List sources, Class clazz) {
        return JSON.parseArray(JSON.toJSONString(sources), clazz);
    }
    private static String[] getNullPropertyNames (Object source) {
        final BeanWrapper src = new BeanWrapperImpl(source);
        java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors();

        Set<String> emptyNames = new HashSet<String>();
        for(java.beans.PropertyDescriptor pd : pds) {
            Object srcValue = src.getPropertyValue(pd.getName());
            if (srcValue == null) {
                emptyNames.add(pd.getName());
            }
        }
        String[] result = new String[emptyNames.size()];
        return emptyNames.toArray(result);
    }

    public static void copyNotNullProperties(Object src, Object target) {
        BeanUtils.copyProperties(src, target, getNullPropertyNames(src));
    }
}
